How to use an anemometer for airflow measurement?
1、 Measurement of Anemometers in Pipelines
Practice has proven that the 16mm probe of the anemometer has a wide range of uses. Its size ensures good permeability and can withstand flow rates up to 60m/s. The measurement of airflow velocity in pipelines is one of the feasible measurement methods, and the direct measurement procedure (grid measurement method) is practical for air measurement.
2、 Measurement of Anemometers in Exhaust Gas Extraction
The ventilation port will greatly alter the relatively balanced distribution of airflow in the pipeline: a high-speed zone is formed on the outer surface of the ventilation port, while other parts are low-speed zones, and vortices are formed on the grid. According to different design methods of the grid, the airflow cross-section is relatively stable at a certain interval (about 500px) in front of the grid. In this situation, measurements are usually carried out using the caliber wheel of a high wind speed instrument. Due to the possibility of achieving uniformity in uneven flow rates due to larger apertures, the uniformity value should be calculated within a larger range.
3、 The anemometer uses a volumetric flow funnel for measurement at the exhaust port
Even if there is no grid disturbance at the extraction point, the path of air flow has no direction, and its airflow cross-section is extremely uneven. The reason for this is the local vacuum inside the pipeline, which funnels the air out into the air chamber. Even in areas with close suction intervals, there is no location that meets the measurement conditions for measurement operations. If the grid measurement method with uniform value calculation function is used for measurement, and the volumetric flow method is used to determine the measurement, and the volumetric flow rate is determined, as long as the pipeline or funnel measurement method can provide repeatable measurement results. In this situation, measuring funnels of different sizes can meet the application requirements. The application of a measuring funnel can generate a fixed cross-section that meets the flow rate measurement conditions at a certain interval in front of the sheet-shaped valve, measure and locate the center of the cross-section and fix it, measure and locate the center of the cross-section and fix it here. The measured value obtained by the flow rate probe is multiplied by the funnel coefficient to calculate the extracted volumetric flow rate.
